After approximately 5300' elevation, an old path (as shown here) can be found on the western slopes of Mac Peak, in the Alpine Lakes Wilderness of Washington State.
The path could have been created by animals or previously used as a fisherman's route, but the actual origins are unknown. Several paths actually ascend the mountain at different locations, overgrown in many places. Regardless of their original purpose, they are almost exclusively used as animal routes on the mountain today (as few people actually climb Mac Peak).
Photo taken on August 23, 2009.